Hi, Paul. Aleph 2s (100w) sound utterly natural, slightly soft at frequency extremes, with no soli-state atrifact. Utterly neutral, with phenomenal, yet not etched, soundstaging; these comments relate to use with the P preamp (be careful how you drive the Alephs, as their low input impedence and gain are issues you need to pay attention to) and in contrast with other solid-state amps. Sorry, have no experience with SF tube gear. Good Luck.
